The 33-year-old New Zealand international will join the Edgbaston outfit for seven matches during the side's NatWest Twenty20 Blast title defence, which is set to start against Worcestershire Rapids on May 22.

It is understood that the Kiwi captain will be available for around half of the Bears' group matches after he joins them ahead of New Zealand's tour of the country.

His debut is in line to be against Lancashire Lightning, the side that the Bears dispatched of on Finals Day at Edgbaston to claim the title back in July.

The New Zealand opener is a prolific run-scorer during the shorter format of the game for his country, managing to be the only international player to score two T20 centuries, and has managed to notch up over 1000 T20 runs during his career.

McCullum will be in action at the IPL next month for Chennai Super Kings, and you can watch the best of the Cricket World Cup runner-up in the video above. He managed to score a half-century in just 19 balls against Sri Lanka as part of an ICC Cricket World Cup warm-up, before leading his side to the final against Australia last week.